Disclosed is a method for increasing the solid state polymerization (SSP) rates of metal catalyzed polyesters. The method comprises in a first step, reacting a dicarboxylic acid or a C
1
-C
4
dicarboxylic diester with a diol at a suitable temperature and pressure to effect esterification or transesterification to prepare a precondensate and in a second step, reacting the precondensate to effect polycondensation at a suitable temperature and pressure to prepare a high molecular weight polyester and in a third step, further increasing the molecular weight and viscosity of the polyester under SSP conditions of a suitable temperature and pressure, where a metal catalyst is added in the first step or in the second step as a reaction catalyst, and where a certain phosphinic acid compound is added in the first step, in the second step or just prior to the third step. The polyester product exhibits low aldehyde formation during melt processing steps as well as excellent color.
本发明揭示了一种提高
金属催化聚
酯固态聚合(S
SP)速率的方法。该方法包括以下步骤:第一步,在适宜的温度和压力下将二
羧酸或C1-C4二
羧酸二
酯与二元醇反应,以进行
酯化或转
酯化反应,制备预聚物;第二步,在适宜的温度和压力下,将预聚物进行聚合反应,制备高分子量聚
酯;第三步,在适宜的温度和压力下,在S
SP条件下进一步提高聚
酯的分子量和粘度,其中在第一步或第二步中加入
金属
催化剂作为反应
催化剂,并在第一步、第二步或第三步前加入特定的
膦酸化合物。该聚
酯产品在熔融加工过程中具有低
醛类物质形成以及优异的颜色。